src-test2/sys/ddb, branch release/9.0.0

Follow up to r225203 refining break-to-debugger run-time configuration

2011-08-27T14:24:27Z

improvements: (1) Implement new model in previously missed at91 UART driver (2) Move BREAK_TO_DEBUGGER and ALT_BREAK_TO_DEBUGGER from opt_comconsole.h to opt_kdb.h (spotted by np) (3) Garbage collect now-unused opt_comconsole.h MFC after: 3 weeks Approved by: re (bz)

Fix making kernel dumps from the debugger by creating a command

2011-06-07T01:28:12Z

for it. Do not not expect a developer to call doadump(). Calling doadump does not necessarily work when it's declared static. Nor does it necessarily do what was intended in the context of text dumps. The dump command always creates a core dump. Move printing of error messages from doadump to the dump command, now that we don't have to worry about being called from DDB.

Trim some additional unnecessary includes.

2011-04-28T17:59:33Z

MFC after: 1 week

- Add the possibility to reuse the already last used timeout when patting

2011-04-27T16:43:03Z

the watchdog, via the watchdog(9) interface. For that, the WD_LASTVAL bitwise operation is used. It is mutually exclusive with any explicit timout passing to the watchdogs. The last timeout can be returned via the wdog_kern_last_timeout() KPI. - Add the possibility to pat the watchdogs installed via the watchdog(9) interface from the kernel. In order to do that the new KPI wdog_kern_pat() is offered and it does accept normalized nanoseconds or WD_LASTVAL. - Avoid to pass WD_ACTIVE down in the watchdog handlers. All the control bit processing should over to the upper layer functions and not passed down to the handlers at all. These changes are intended to be used in order to fix up the watchdog tripping in situation when the userland is busted, but protection is still wanted (examples: shutdown syncing / disk dumping). Sponsored by: Sandvine Incorporated Reviewed by: emaste, des, cognet MFC after: 2 weeks

Extend the DDB command "watchdog" with the ability to specify a timeout

2011-04-05T14:15:58Z

value. The timeout is expressed in the form T(N) = (2^N * nanoseconds) and can be easilly extracted from the watchdog interface as a WD_TO_* macro. That new functionality is supposed to fix re-entering the kernel from DDB re-enabling the watchdog again (previously disabled) and also offer the possibility to break for deadlocked DDB commands. Please note that retro-compatibility is retained. Sponsored by: Sandvine Incorporated Approved by: des MFC after: 10 days

Modify kdb_trap() so that it re-calls the dbbe_trap function as long as

2011-02-18T22:25:11Z

the debugger back-end has changed. This means that switching from ddb to gdb no longer requires a "step" which can be dangerous on an already-crashed kernel. Also add a capability to get from the gdb back-end back to ddb, by typing ^C in the console window. While here, simplify kdb_sysctl_available() by using sbuf_new_for_sysctl(), and use strlcpy() instead of strncpy() since the strlcpy semantic is desired. MFC after: 1 month

sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly.

2011-01-12T19:54:19Z

Commit the kernel changes.

One more use for _SIG_VALID.

2010-07-12T10:18:10Z

Submitted by: Garrett Cooper MFC after: 1 week

MFp4 @178364:

2010-05-24T16:41:05Z

Implement an optional delay to the ddb reset/reboot command. This allows textdumps to be run automatically with unattended reboots after a resonable timeout, while still permitting an administrator to break into debugger if attached to the console at the time of the event for further debugging. Cap the maximum delay at 1 week to avoid highly accidental results, and default to 15s in case of problems parsing the timeout value. Move hex2dec helper function from db_thread.c to db_command.c to make it generally available and prefix it with a "db_" to avoid namespace collisions. Reviewed by: rwatson MFC after: 4 weeks

There is not a good reason to have a different prototype for db_printf()

2010-05-11T17:01:14Z

when compared to printf(). Unify it by returning the number of characters displayed for db_printf() as well. MFC after: 7 days